d^2+2-20=0

Solution for d^2+2-20=0 equation:

Simplifying
d2 + 2 + -20 = 0

Reorder the terms:
2 + -20 + d2 = 0

Combine like terms: 2 + -20 = -18
-18 + d2 = 0

Solving
-18 + d2 = 0

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + d2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + d2 = 0 + 18
d2 = 0 + 18

Combine like terms: 0 + 18 = 18
d2 = 18

Simplifying
d2 = 18

Take the square root of each side:
d = {-4.242640687, 4.242640687}